Cover potatoes with water in a large pot and add 1/4 teaspoon. of salt to water. Cover and bring to a boil, then reduce to a simmer. Cook until potatoes are softened, but not fully cooked through, about 10 minutes. Drain and place potatoes in a medium bowl. Add olive oil and dill. Season generously with salt and pepper. Mix everything and place on foiled lined sheet pan.

Roast in a 350 degree oven for 35-minutes.

Meanwhile make a sauce. Put all ingredients into food processor. Puree until smooth. Adjust salt and pepper and put sauce in a small serving dish. Serve immediately with potatoes.